Sum of the element occurence

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yiwen yim
yiwen yim 2018-4-29
评论： Ameer Hamza 2018-4-29
Greetings Matlab Community,
I've manage to sum up the occurrence of number 2 of the entire matrix by using this,
chromo = [1 1 2 4 6 1 ; 2 1 3 5 7 2];
sum(chromo(:) == 2)
How do i sum up the occurrence of number 2 in just a row in the matrix and not the entire matrix?

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Ameer Hamza
Ameer Hamza 2018-4-29
If A is the matrix, you can do this as follow
numOfTwos = sum(A==2, 2);
myResult = numOfTwos(rowNumber);
The above will numOfTwos will give number fo two in all the rows of matrix A. If you just want it for one row, use
numOfTwos = sum(A(rowNumber, :) ==2, 2);
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Ameer Hamza
Ameer Hamza 2018-4-29
@yiwen yim answer moved here
"Also for a particular row."
Ameer Hamza
Ameer Hamza 2018-4-29
For particular row you can do this
numOfTwos = sum(A(3, :) ==2, 2);
It will tell you number of twos in row 3.

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更多回答（2 个）

yiwen yim
yiwen yim 2018-4-29
I would like to know how to do it for each row.
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Ameer Hamza
Ameer Hamza 2018-4-29
Please delete this answer, and discuss it in the comment section.

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yiwen yim
yiwen yim 2018-4-29
Also for a particular row.

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